Goldstone Radar Observations of 2015 QT3

We would like to thank everyone that reported astrometry and made these radar observations possible.
Here are some astronomers that directly sent us the measurements, but this is not a complete list, and we apologize for anyone that did not get a well deserved credit:
Sergio Foglia and Astronomical Research Observatory, Westfield, Melissa Brucker, Kristie Nault, and Adler Planetarium, Tim Lister and Cerro Tololo-LCOGT C, Francois Kugel and
Observatoire Chante-Perdrix, Dauban, Luca Buzzi and Schiaparelli Observatory, Markus Griesser and Eschenberg Observatory, Winterthur

2015 QT3 was a moderate radar target on Aug 27, 2015 at Goldstone. Its Doppler bandwidth of ~30 Hz and an upper bound estimate of
its diameter, ~50 m, based on 15-m resolution detection, suggest a rotation period 5-15 min. This appears consistent with Brian
Warner's (personal comm.) period estimate of ~14 min based on the lightcurves.
The weak echo visible in 15-m resolution delay-Doppler images drifts at about 2 us/hour rate, consistent with ~5 hz Doppler error.
The orbit has been updated with 2 Doppler and 3 range measurements.

Goldstone-GBT Radar Images of 2003 RB

Delay-Doppler images of 2003 RB obtained on Aug 24, 2015 using DSS-14 to transmit and GBT to receive. Resolution is
7.5 m x 0.1 Hz. Range increases down and Doppler frequency increases to the right. The images span an interval of
about 2 hours and 15 minutes.